The folks at Elliptigo takes one of the most effective, low-impact aerobic workout in the gym and turns it into a mobile machine. The Elliptigo 8S ($2,100) is designed to help runners avoid hassles of injuries through repeated impact by using the same energy and stride to power this machine in motion. It features an aluminum frame, patented Elliptidrive technology, telescopically adjustable steering, speeds up to 15 to 20 mph, and many more.